Filing down drop out slot surfaces is a time honored method to correct less then best alignment. Done this many dozens of times, many dozens. Al long as the QR will keep the axle in the location you initially set it at, to attain wheel/frame coplaneness (alignment) there is no real issue. The phrase "don't fix what's not wrong" comes to mind. A QR with steel serrated drop out contacting faces and having an internal cam with NO plastic goes a long way to insure axle placement. Really this is what we did when horizontal drop out slots were the norm.


Having said that my sensibilities would want the wheel to fit in the aligned arrangement with only gravity to make quick reinstalls easy. On road flat repairs go faster and with led fiddling about this way. But my sensibilities don't ride or steer the bike. Andy